The Cadillac XLR features a magnetic-fluid-based real-time damping suspension that continually adapts to different road conditions. It's propelled by a 320 horsepower 4.6-liter Northstar V8 engine mated to a six-speed automatic transmission with manual shift mode. Unique to luxury sports cars and to achieve a proper 50/50 weight distribution, the transmission is mounted in the rear. Standard safety features include four-wheel anti-lock disc brakes, side-impact air bags with head and thorax protection, electronic vehicle stability control, and traction control. For 2009 the Cadillac XLR receives an interior and exterior refresh.